<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var obj = {};
        
        Object.defineProperties(obj,{
            name:{
                value:"老王",
                writable:true
            }
        });

        obj.name = '小李';

        console.log(obj);

    </script>
</body>
</html>